The reason you might want to avoid updating is to ensure your Fire TV Stick is as compatible as possible with a potential future rooting method.While the Fire TV Stick currently cannot be rooted, staying on an old software version gives you the most flexibility for future rooting and mods.
Our experience with the Fire TV has shown us that different software version will handle failed updates differently.
But if you want to run something else in Slide, it may be a problem.
You could automatically add a NTP server to the next update of Slide OS config until this bug is tracked down. The Country and time zone are set correctly in the International settings.
If you are blocking updates, the Fire TV Stick will not allow you to complete the initial setup.
The video above and instructions below will show you how to get past the forced update in order to complete the initial setup without updating.